Firebug is stopping even where no breakpoint is set

The problem still exists in Firefox 88.0 (64bit): a source line breakpoint is sometimes hit after it has been cleared. I found that the breakpoint can be cleared by simply restarting Firefox.

I had the same problem firebug stopped in every exception. I am not sure from what version this exists but I have Firefox v59. In debugger tab disable "Ignore exceptions. Click to pause on uncaught exceptions". The right icon above "Watch expressions"

I have found the solution to my problem. I just reset all options in Firebug.

To do this:

1. click on the bug
2. click the Options menu item (which slides a new menu to the right)
3. click the item "Reset All Firebug Options"

That cleared it up.

Cheers